Dynamo-electric machine.



PATENTED' JUNE 20, 1905,

C. S. DUNN.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED OCT. 24, 1904.

" UNITED STATES Patented June 20, 1905.

PATENT OFFICE.

GANO S. EUNN, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO CROCKER- WHEELERCOMPANY, OF AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DYNAMIC-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 792,762, dated June 20,1905.

Application filed October 24, 1904. Serial No. 229,738.

To all whom it flea/y concern.-

Be it known that I, GANO SILLICK DUNN, a citizen of the United States ofAmerica, and a resident of East Orange, countyof Essex,

State of New Jersey, have invented certain new and useful Improvementsin Dynamo- Electric Machines, of which the following is a specification.

This invention relates to an improvement in dynamo-electric machines ofthe substantially inclosed type, wherein the bearing for the end of thearmature-shaft adjoining the commutator is supported by-an end shieldwhich is secured to the inclosing frame, preferably by screws,this beinga type of construction of manifest advantage by-reason of theconvenience of manufacture and machining of the parts to secure properalinement.

The object of my invention is, while retaining this type ofconstruction, to do away with the complications, large number of parts,difficulty of insulation, danger of vibration, and liability toshrinkage and consequent looseness usually found in brush-riggings andto i provide an inexpensive brush-rigging wherein the end shield isutilized directly as a support for the brush-holders, theattachingscrews of which form the connection for the outside conductors,and thereby save a special terminal board. Suitable provision is madefor the proper setting of the brushes at their proper points for minimumsparking by the mere provision of elongated or large holes or slots forthe screws which hold the end shield to the frame, so that such shiftingof the brushes as may be required is effected by loosening the screwswhich hold the end shield to the frame and rotating the shield as awhole.

In the accompanying sheet of drawings, which forms a part of thisapplication, Figure 1 is a vertical section through the inclosing frameof a dynamoelectric machine embodying my invention, the front shieldbeing broken away on the line A B of Fig. 2 and the rear shield beingbroken away on the line A C. Fig. 2 is an elevation of the machine inwhich portions of the front shield and the inclosing frame at the rightare broken away.

and an armature alies between the coils, all

of these parts being inclosed and protected by the frame. The open endsof the frame are bored out in alinement with the axis 5c 50 of themachine and faced off at right angles thereto. A front end shield 5 anda rear end shield 6 cover the open ends. Flanges 7, which are parts ofthe end shields, are turned to fit the bored holes in the ends of theinclosing frame and are means for centering and alining the shields withrespect to the frame, The shield 5 incloses and protects the commutatorS and supports a bearing 9 for the armatureshaft adjoining and outsidethe commutator. Four insulating-bushings 10, of porcelain, pass throughtapering holes in the shield and are fastened in place by type-metal 11.Metallic studs 12 pass through two of these bushings and screw intobrushholders 13 on the inner side of the shield. Nuts 14 on the outerends of the studs draw the brush-holders firmly against the ends of thebushings. Tongues 15, formed on the hubs of the brush-holders, fit intoslots in the ends of the bushings and hold the brush-holders firmly inangular relations, so that the brush-holders and studs are rigidlysupported by the end shield, and the outwardly-projecting ends of thestuds can be employed as the terminals of the machine, to which theconductors leading away from the machine are connected. The other twobushings carry terminal studs 16 for the field connections. Nuts 14/ onthe ends of the studs clamp them in the bushings. Additional nuts 14bind the ends of the fieldwires on the inner side of the shield and thefield connections on the outer side of the shield. Carbon brushes 17 areguided in the the commutator.

brush-holders and pressed by springs 18 tion is intermediate of thepositions for run-- ning in either direction exclusively, provision isnecessary for the adjustment of the brushes around the commutator. Forthis purpose circumferential slots19 are placed in the rim of theshield, and cap-screws 20 pass through these slots and are tapped intothe frame of the machine to permit of circumferential adjustment of theend shield to bring the brushes to the desired positions. These slottedholes are unequally spaced around the rim, so that assembly is possibleonly in one way, and the user will be prevented from attempting toassemble differently to adapt the motor to different suspensions.

To render the machine adaptable to wall or ceiling suspension, as wellas to support from the floor, in all of which positions the bearing,which is self-oiling, must be kept with the same side up, provision ismade for the setting of the bearing to either of four positionsWithoutrernoving or loosening the end shield and disturbing theadjustment of the brushes. The support for the bearing in the end shieldis chambered on all sides of the shaft for an oil-well. There are fourholes 21 around the sides of this chambered hub of the end shield, and apetcock 22 is screwed in whichever one is lowest. depending on thesuspension to draw out the oil. The other the shaft.

the frame and turned to bring the bearing 7 right side up when thedirection of suspension of the machine is changed. The shield? is heldto the frame by four screws 26, which are evenly spaced. so as to permitof the attachment of the shield to the frame in either of the fourpositions nesessary for this purpose. 7

What I claim as new, and desire te-secure by Letters Patent of theUnited States, is-

In a dynamo-electric machine, the combination with the field, armatureand commutator, of an inclosing frame for the'field and armature,brush-holders,-abearing forthe armature-shaft adjoining and outside'thecommutator,and an end shieldprovided Witha support for said bearing andcircumferential slots, means for centering the end shield with respectto the inclosin'g' frame, screws passing through the slots forattachment of the shield'to the inclosin'g frame, insulating bushingsrigidly supported in theen'd shield, metallic studs rigidly supported inthe-bushings andpassing through 'the shield, 'the inner ends of thestuds'serving as supports for the brush-holders and the outer endsserving-as terminals for the machine, substantially a described.

Signed by me at East Orange, New Jersey, the 21st day of October, 1904.a i

GANO SI'D UN Witnesses:

HOWARD M. GASSMAN, ROBERT B. TREAT.

